condition mean min max ZT0-3 5.64955 4.486585 6.650785 ZT4-7 4.7432549999999996 4.7432549999999996 4.7432549999999996 ZT8-11 5.8269400000000005 5.8269400000000005 5.8269400000000005 ZT12-15 18.15195 16.4515 19.8524 ZT16-19 15.66395 15.66395 15.66395 ZT20-23 12.43965 12.43965 12.43965